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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/audio_processing/echo_detector/circular_buffer.h"
#include <algorithm>
#include "rtc_base/checks.h"
namespace webrtc {
CircularBuffer::CircularBuffer(size_t size) : buffer_(size) {}
CircularBuffer::~CircularBuffer() = default;
void CircularBuffer::Push(float value) {
buffer_[next_insertion_index_] = value;
++next_insertion_index_;
next_insertion_index_ %= buffer_.size();
RTC_DCHECK_LT(next_insertion_index_, buffer_.size());
nr_elements_in_buffer_ = std::min(nr_elements_in_buffer_ + 1, buffer_.size());
RTC_DCHECK_LE(nr_elements_in_buffer_, buffer_.size());
}
absl::optional<float> CircularBuffer::Pop() {
if (nr_elements_in_buffer_ == 0) {
return absl::nullopt;
}
const size_t index =
(buffer_.size() + next_insertion_index_ - nr_elements_in_buffer_) %
buffer_.size();
RTC_DCHECK_LT(index, buffer_.size());
--nr_elements_in_buffer_;
return buffer_[index];
}
void CircularBuffer::Clear() {
std::fill(buffer_.begin(), buffer_.end(), 0.f);
next_insertion_index_ = 0;
nr_elements_in_buffer_ = 0;
}
} // namespace webrtc
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